Resource exclusion for device to device communication

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select, in a first time slot, a set of resources to use for transmission to another UE; evaluate, in a second time slot, whether one or more resources of the set of resources is available; and transmit, based on the one or more resources of the set of resources being available, information to the other UE in a third time slot and using the set of resources, or reselect, based on the one or more resources of the set of resources being unavailable, another resource for transmission of the information to the other UE. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to U.S. Provisional Patent ApplicationNo. 62/769,860, filed on Nov. 20, 2018, entitled “RESOURCE EXCLUSION FORDEVICE TO DEVICE COMMUNICATION,” which is hereby expressly incorporatedby reference herein.

INTRODUCTION

Aspects of the present disclosure generally relate to wirelesscommunication, and more particularly to techniques and apparatuses fordevice to device communication.

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipments(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in LTE and NRtechnologies. Preferably, these improvements should be applicable toother multiple access technologies and the telecommunication standardsthat employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by a userequipment (UE), may include determining, in a first time slot, whether aselected subset of candidate resources is still available fortransmission to another UE in a second time slot that is after the firsttime slot. The method may include selectively transmitting informationto the other UE in the second time slot based at least in part onwhether the selected subset of candidate resources is still available.

In some aspects, a UE for wireless communication may include memory andone or more processors coupled to the memory. The memory and the one ormore processors may be configured to determine, in a first time slot,whether a selected subset of candidate resources is still available fortransmission to another UE in a second time slot that is after the firsttime slot. The memory and the one or more processors may be configuredto selectively transmit information to the other UE in the second timeslot based at least in part on whether the selected subset of candidateresources is still available.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a UE, may causethe one or more processors to determine, in a first time slot, whether aselected subset of candidate resources is still available fortransmission to another UE in a second time slot that is after the firsttime slot. The one or more instructions, when executed by the one ormore processors of the UE, may cause the one or more processors toselectively transmit information to the other UE in the second time slotbased at least in part on whether the selected subset of candidateresources is still available.

In some aspects, an apparatus for wireless communication may includemeans for determining, in a first time slot, whether a selected subsetof candidate resources is still available for transmission to another UEin a second time slot that is after the first time slot. The apparatusmay include means for selectively transmitting information to the otherUE in the second time slot based at least in part on whether theselected subset of candidate resources is still available.

In some aspects, a method of wireless communication, performed by a UE,may include selecting, in a first time slot, a set of resources to usefor transmission to another UE. The method may include evaluating, in asecond time slot, whether one or more resources of the set of resourcesis available. The method may include transmitting, based on the one ormore resources of the set of resources being available, information tothe other UE in a third time slot and using the set of resources, orreselecting, based on the one or more resources of the set of resourcesbeing unavailable, another resource for transmission of the informationto the other UE.

In some aspects, a UE for wireless communication may include memory andone or more processors coupled to the memory. The memory and the one ormore processors may be configured to select, in a first time slot, a setof resources to use for transmission to another UE. The memory and theone or more processors may be configured to evaluate, in a second timeslot, whether one or more resources of the set of resources isavailable. The memory and the one or more processors may be configuredto transmit, based on the one or more resources of the set of resourcesbeing available, information to the other UE in a third time slot andusing the set of resources, or reselect, based on the one or moreresources of the set of resources being unavailable, another resourcefor transmission of the information to the other UE.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a UE, may causethe one or more processors to select, in a first time slot, a set ofresources to use for transmission to another UE, evaluate, in a secondtime slot, whether one or more resources of the set of resources isavailable, and transmit, based on the one or more resources of the setof resources being available, information to the other UE in a thirdtime slot and using the set of resources, or reselect, based on the oneor more resources of the set of resources being unavailable, anotherresource for transmission of the information to the other UE.

In some aspects, an apparatus for wireless communication may includemeans for selecting, in a first time slot, a set of resources to use fortransmission to another UE. The apparatus may include means forevaluating, in a second time slot, whether one or more resources of theset of resources is available. The apparatus may include means fortransmitting, based on the one or more resources of the set of resourcesbeing available, information to the other UE in a third time slot andusing the set of resources, or means for reselecting, based on the oneor more resources of the set of resources being unavailable, anotherresource for transmission of the information to the other UE.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and processing system assubstantially described herein with reference to and as illustrated bythe accompanying drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram conceptually illustrating an example of awireless communication network, in accordance with various aspects ofthe present disclosure.

FIG. 2 is a block diagram conceptually illustrating an example of a userequipment, in accordance with various aspects of the present disclosure.

FIGS. 3A and 3B are diagrams illustrating an example of resourceexclusion for device to device communication, in accordance with variousaspects of the present disclosure.

FIG. 4 is a diagram illustrating an example process performed, forexample, by a user equipment, in accordance with various aspects of thepresent disclosure.

FIG. 5 is a diagram illustrating an example process performed, forexample, by a user equipment, in accordance with various aspects of thepresent disclosure.

DETAILED DESCRIPTION

In some communications systems, two or more subordinate entities (e.g.,UEs) may communicate with each other using sidelink signals. Real-worldapplications of such sidelink communications may include public safety,proximity services, UE to network relaying, vehicle to vehicle (V2V)communications, vehicle to everything (V2X) communications, Internet ofEverything (IoE) communications, IoT communications, mission-criticalmesh communications, peer to peer (P2P) communications, device to device(D2D) communications, and/or various other suitable applications.Generally, a sidelink signal may refer to a signal communicated from onesubordinate entity to another subordinate entity without relaying thatcommunication through a scheduling entity (e.g., a UE or a BS), eventhough the scheduling entity may be utilized for scheduling and/orcontrol purposes. Although some aspects described herein are describedin terms of a UE being a subordinate entity, other configurations arecontemplated, such as a BS being a subordinate entity. In some cases,sidelink communications may occur in unlicensed spectrum, which may usespectrum sharing.

In some communications systems, spectrum sharing may be used to sharespectrum between different operators, cells, UEs, and/or the like. Someoperators may use a contention-based approach to share spectrum. Forexample, a first UE that wishes to communicate with a second UE inshared spectrum may perform a contention-based approach, such as alisten-before-talk (LBT) procedure, a random resource selectionprocedure, a request response based resource selection procedure, and/orthe like. In this way, the first UE may reserve resources forcommunication and avoid interference associated with transmissions froma third UE.

In such a contention-based approach, the first UE may exclude, from aset of available resources for transmission to the second UE, one ormore resources that are being utilized by other UEs in proximity to thefirst UE. For example, a third UE may transmit control informationindicating that the third UE is to transmit from a first slot n−2 to athird slot n using a particular subchannel. The first UE may determinewhich resources to exclude based at least in part on the controlinformation identifying used resources, based at least in part on areference signal received power of the control information indicating alikelihood of interference, or based at least in part on locationinformation in the control transmission indicating a likelihood ofinterference, and/or the like. In this case, the first UE may determineto avoid selecting resources from the particular subchannel from thefirst slot to the third slot when attempting to transmit to the secondUE.

However, determining which resources to exclude from use fortransmission, selecting resources for transmission, and preparing totransmit using selected resources may take an excessive amount of timeby a UE. Moreover, control information identifying which resources toexclude may not be received until a slot that immediately precedes aslot in which the UE wishes to transmit, which may not provide enoughtime for UEs with limited processing capabilities to perform proceduresassociated with preparing for transmission. For example, after receivingthe control information, a UE may need to decode the control informationof a physical sidelink control channel (PSCCH). Additionally, oralternatively, the UE may need to determine which resources to excludeand select resources to use. Additionally, or alternatively, the UE mayneed to encode the information for transmission using selectedresources, perform physical channel generation for encoded information(e.g., scrambling, modulation, and/or the like), perform resourceelement mapping for the physical channel, and generate an orthogonalfrequency division multiplexing (OFDM) signal based at least in part onthe resource element mapping. Additionally, or alternatively, the UE mayneed to prepare an antenna to transmit the OFDM signal.

Some aspects described herein may perform an advance resource selectionand transmission preparation to enable a UE to satisfy a processingtimeline constraint. For example, a UE may determine, in a first slot,whether a selected subset of candidate resources is still available fortransmission in a second slot that follows the first slot. In this case,the UE may have selected the subset of candidate resources andproactively prepared for transmission in a zero^(th) slot occurringbefore the first slot. Further, the UE may selectively transmitinformation using the selected subset of candidate resources based atleast in part on determining whether the selected subset of candidateresources is still available. For example, in the zero^(th) slot, the UEmay generate an OFDM signal for transmitting information in the secondslot, in the first slot the UE may determine whether to transmit theOFDM signal in the second slot, and in the second slot the UE maytransmit the OFDM signal. In this way, by pre-generating the OFDM signalfor transmission using pre-selected resources, rather than generatingthe OFDM signal on-demand when resources are determined to be available,the UE enables satisfaction of processing timeline constraints.

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based at least inpart on the teachings herein one skilled in the art should appreciatethat the scope of the disclosure is intended to cover any aspect of thedisclosure disclosed herein, whether implemented independently of orcombined with any other aspect of the disclosure. For example, anapparatus may be implemented or a method may be practiced using anynumber of the aspects set forth herein. In addition, the scope of thedisclosure is intended to cover such an apparatus or method which ispracticed using other structure, functionality, or structure andfunctionality in addition to or other than the various aspects of thedisclosure set forth herein. It should be understood that any aspect ofthe disclosure disclosed herein may be embodied by one or more elementsof a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a network 100 in which aspects of thepresent disclosure may be practiced. The network 100 may be an LTEnetwork, a 5G or NR network, and/or the like. Wireless network 100 mayinclude a number of BSs 110 (shown as BS 110 a, BS 110 b, BS 110 c, andBS 110 d) and other network entities. ABS is an entity that communicateswith user equipment (UEs) and may also be referred to as a base station,a NR BS, a Node B, a gNB, a 5G node B (NB), an access point, a transmitreceive point (TRP), and/or the like. Each BS may provide communicationcoverage for a particular geographic area. In 3GPP, the term “cell” canrefer to a coverage area of a BS and/or a BS subsystem serving thiscoverage area, depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. The BS may perform somescheduling and/or control in the network, such as by indicating to UEs aresource grid that the UEs are to use. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). ABS for a macro cell may bereferred to as a macro BS. A BS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1, a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some examples, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some examples, the BSs may be interconnected to oneanother and/or to one or more other BSs or network nodes (not shown) inthe access network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1, a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 Watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. The network controller may alsoprovide information identifying a resource grid that UEs may use, suchas information identifying a location of subchannels, a timing of slots,and/or the like. Network controller 130 may communicate with the BSs viaa backhaul. The BSs may also communicate with one another, e.g.,directly or indirectly via a wireless or wireline backhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, and/or the like. A UE may be a cellularphone (e.g., a smart phone), a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or equipment, biometric sensors/devices,wearable devices (smart watches, smart clothing, smart glasses, smartwrist bands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., a remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular RAT andmay operate on one or more frequencies. A RAT may also be referred to asa radio technology, an air interface, and/or the like. A frequency mayalso be referred to as a carrier, a frequency channel, and/or the like.Each frequency may support a single RAT in a given geographic area inorder to avoid interference between wireless networks of different RATs.In some cases, NR or 5G RAT networks may be deployed.

As shown in FIG. 1, the UE 120 e may include a communication manager140, and may be in communication (e.g., sidelink communication oranother type of device to device communication) with the UE 120 a). Asdescribed in more detail elsewhere herein, the communication manager 140may determine, in a first time slot, whether a selected subset ofcandidate resources is still available for transmission to another UE ina second time slot that is after the first time slot. Additionally, oralternatively, the communication manager 140 may selectively transmitinformation to the other UE in the second time slot based at least inpart on whether the selected subset of candidate resources is stillavailable. Additionally, or alternatively, the communication manager 140may perform one or more other operations described herein.

As indicated above, FIG. 1 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 1.

FIG. 2 shows a block diagram of a design 200 of UE 120, which may be oneof the UEs in FIG. 1. UE 120 may be equipped with R antennas 252 athrough 252 r, where in general R≥1.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom, for example, another UE 120, a base station 110 and/or other basestations and may provide received signals to demodulators (DEMODs) 254 athrough 254 r, respectively. The downlink signals may include controlinformation indicating a reservation of resources, as described in moredetail below. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. For example, UE 120 may receive and processdata in advance of a transmission opportunity to prepare to transmit toanother UE 120 at the transmission opportunity, as described below.Transmit processor 264 may also generate reference symbols for one ormore reference signals. The symbols from transmit processor 264 may beprecoded by a TX MIMO processor 266 if applicable, further processed bymodulators 254 a through 254 r (e.g., for DFT-s-OFDM, CP-OFDM, and/orthe like), and transmitted to base station 110.

Controller/processor 280 of UE 120 and/or any other component(s) of FIG.2 may perform one or more techniques associated with resource exclusionfor device to device communication, such as sidelink communication, asdescribed in more detail elsewhere herein. For example,controller/processor 280 of UE 120 and/or any other component(s) of FIG.2 may perform or direct operations of, for example, process 400 of FIG.4, process 500 of FIG. 5, and/or other processes as described herein.Memory 282 may store data and program codes for UE 120.

In some aspects, the UE 120 may include means for determining, in afirst time slot, whether a selected subset of candidate resources isstill available for transmission to another UE in a second time slotthat is after the first time slot, means for selectively transmittinginformation to the other UE in the second time slot based at least inpart on whether the selected subset of candidate resources is stillavailable, and/or the like. In some aspects, the UE 120 may includemeans for selecting, in a first time slot, a set of resources to use fortransmission to another UE, means for evaluating, in a second time slot,whether the set of resources is available, means for transmitting, basedon the set of resources being available, information to the other UE ina third time slot and using the set of resources, means for reselecting,based on the set of resources being unavailable, another resource fortransmission of the information to the other UE, and/or the like.Additionally, or alternatively, the UE 120 may include means forperforming one or more other operations described herein. In someaspects, such means may include the communication manager 140.Additionally, or alternatively, such means may include one or morecomponents of the UE 120 described in connection with FIG. 2.

As indicated above, FIG. 2 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 2.

FIGS. 3A and 3B are diagrams illustrating an example 300 of resourceexclusion for device to device communication, in accordance with variousaspects of the present disclosure. As shown in FIG. 3A, example 300 mayinclude a set of UEs 120 (e.g., a first UE 120, a second UE 120, a thirdUE 120, and a fourth UE 120).

As further shown in FIG. 3A, first UE 120 may determine to transmitinformation to second UE 120 at a particular slot n (e.g., in a secondsubchannel). Further, third UE 120 may transmit using a first subchannelin a first set of slots (e.g., slots n−2 to n). In this case, third UE120 may transmit control information c1 in slot n−2 to indicate thatthird UE 120 is to transmit until slot n. Similarly, fourth UE 120 maytransmit using a third subchannel in a second set of slots (e.g., slotsn−1 to n+2). In this case, fourth UE 120 may transmit controlinformation c2 in slot n−1 to indicate that fourth UE 120 is to transmituntil slot n+2.

As shown in FIG. 3A, and by reference number 310, first UE 120 mayprepare information for transmission to second UE 120. For example,during slot n−2, UE 120 may select a set of resources (e.g., one or moreresources) for transmission of information to second UE 120. In someaspects, UE 120 may select the set of resources based at least in parton excluding other resources. For example, based at least in part oncontrol information c1, UE 120 may exclude resources of slots n−2 to nin the first sub channel. In some aspects, first UE 120 may proactivelyperform one or more processing steps associated with preparing theinformation for transmission using the set of resources. For example,first UE 120 may generate an OFDM signal before the set of resourcesoccurs and before evaluating whether the set of resources will beavailable for transmission. In this way, first UE 120 ensures that firstUE 120 is ready to transmit the information using the set of resourcesif the set of resources is evaluated to be available.

In some aspects, first UE 120 may identify a quantity of resources toselect as the set of resources. For example, based at least in part on asize of the information, first UE 120 may select a quantity of timeresources and/or frequency resources (e.g., a quantity of resourceblocks, a quantity of slots, a quantity of subchannels, and/or the like)to use to transmit the information. In this case, first UE 120 mayselect a next available time slot (e.g., slot n) in which UE 120 may beable to transmit the information based at least in part on the nextavailable time slot not already being reserved for another transmission(e.g., by third UE 120 or fourth UE 120). In some aspects, first UE 120may generate one or more modulated symbols. For example, first UE 120may generate the one or more modulated symbols for transmission in thenext available resources.

In some aspects, first UE 120 may evaluate when to select the set ofresources and proactively prepare for transmission based at least inpart on a timeline. For example, first UE 120 may evaluate a firsttimeline representing a time from reception of control information(e.g., c1 or c2) to prepare to transmit the information. In this case,the first timeline may represent a processing time to process thecontrol information to evaluate whether the set of available resourcesis still available. Additionally, or alternatively, first UE 120 mayevaluate a second timeline representing a processing time to evaluateavailable resources, select a set of available resources, map at leastone generated modulated symbol to the set of available resources,generate a transmit waveform for the at least one modulated symbol, andready an antenna for transmission. Additionally, or alternatively, firstUE 120 may evaluate a third timeline representing a processing time toevaluate available resources, select a set of available resources,re-encode the information and generate a physical channel, map at leastone generated modulated symbol of the information to the set ofavailable resources, generate a transmit waveform for the at least onemodulated symbol, and ready an antenna for transmission.

In some aspects, first UE 120 may evaluate at least one of the timelines(e.g., the first timeline, the second timeline, the third timeline,and/or the like) based at least in part on a UE capability of first UE120 (e.g., a processing capability). In some aspects, first UE 120 mayevaluate at least one of the timelines as a particular quantity ofslots, a particular quantity of symbols, an amount of time, and/or thelike. In some aspects, first UE 120 may evaluate at least one of thetimelines based at least in part on a subcarrier spacing. In someaspects, first UE 120 may evaluate when to select the set of availableresources based at least in part on at least one of the timelines. Forexample, first UE 120 may select the set of available resources in slotn−2 based at least in part on an evaluation that first UE 120 maysatisfy the second timeline in two slots. Similarly, first UE 120 mayselect slot n for a start of a transmission of the information based atleast in part on evaluating that first UE 120 may satisfy the firsttimeline in one slot (e.g., from receiving control information c2).

As shown in FIG. 3A, and by reference number 320, first UE 120 mayevaluate whether one or more of the set of resources is available fortransmission. In this case, resources may be referred to as availablewhen the resources are unoccupied by another UE 120 for transmission,and may be referred to as unavailable when the resources are reserved oroccupied by another UE 120 for transmission. For example, in slot n−1,first UE 120 may decode control information c2, and may evaluate whetherenough of the set of resources is available to transmit information forwhich the set of resources was reserved. For example, if first UE 120selected slots n to n+2 of the second subchannel for transmission, firstUE 120 may evaluate that the set of resources is available (e.g., thewhole set, a subset of the set, a single resource, and/or the like). Incontrast, based at least in part on control information c2, if first UE120 selected slots n to n+2 of the third subchannel, first UE 120 mayevaluate that the set of resources is not available. In this case, firstUE 120 may trigger regeneration of an OFDM signal and may attempttransmission at slot n+1, which may occur if first UE 120 evaluates, inslot n, that resources of slot n+1 (e.g., of the second subchannel) areavailable for transmission.

In some aspects, first UE 120 may evaluate whether the set of resourcesis available in slot n−1 based at least in part on evaluating that firstUE 120 may satisfy the first timeline, described above, in a singleslot.

As shown in FIG. 3A, and by reference number 330, first UE 120 maytransmit information to second UE 120 in slot n. For example, based atleast in part on the set of resources being available, first UE 120 maytransmit to second UE 120 in slots n to n+2 (e.g., in the secondsub-channel or the fourth sub-channel). In this way, first UE 120transmits the information to second UE 120 in slot n based at least inpart on proactively preparing the information for transmission (e.g., inslot n−2), thereby enabling device-to-device transmission in unlicensedspectrum. Moreover, based at least in part on proactively preparing theinformation for transmission, first UE 120 is able to transmit in slot neven with less than a threshold amount of processing resources, therebyenabling satisfaction of one or more timing requirements associated withtransmission in unlicensed spectrum.

As shown in FIG. 3B, and by reference number 330′, first UE 120 mayrefrain from transmitting information to second UE 120. For example,based at least in part on the set of resources not still beingavailable, first UE 120 may not transmit the information to second UE120 in slot n. In some aspects, first UE 120 may evaluate to defertransmission of the information. For example, first UE 120 may evaluateto re-attempt transmission of the information in a subsequent slot thatis at least a threshold time after slot n. In this case, the thresholdtime may be defined as a time less than the second timeline describedabove. For example, first UE 120 may determine an amount of processingtime that is to be used to reselect different resource blocks and maywait for the subsequent slot to transmit using the current resourceblocks.

In some aspects, first UE 120 may reselect resource blocks based atleast in part on the set of resources not still being available. Forexample, first UE 120 may determine that the amount of processing time(e.g., the second timeline) to reselect different resource blocks isshorter than an amount of time to wait for a subsequent slot to transmitusing current resource blocks. In this case, first UE 120 may reselectthe different resource blocks, and may transmit the information usingthe different resource blocks. In some aspects, first UE 120 mayreselect resource blocks based at least in part on an availability of analternate set of resources of a same size as the set of availableresources. In some aspects, first UE 120 may alter a modulation andcoding scheme and reencode the information for transmission. Forexample, when alternate available resources are not occurring untilafter a threshold period of time, first UE 120 may select a highermodulation and coding scheme, and may reencode the information using thehigher modulation and coding scheme. In some aspects, first UE 120 mayreencode based at least in part on a link budget requirement of first UE120.

In some aspects, first UE 120 may reencode the information and reselectresources blocks for transmitting the information (e.g., based at leastin part on the third timeline). For example, when available resourcesoccur at a time satisfying the third timeline, first UE 120 may reencodethe information and reselect the resource blocks. In some aspects, firstUE 120 may reencode the information and reselect the resource blocksbased at least in part on a quality of service requirement (e.g.,whether a modulation and coding scheme and a quantity of slots for thereselected resource blocks satisfy a link budget requirement). In thiscase, based at least in part on deferring transmission, reselectingresource blocks, reencoding the information, a combination thereof,and/or the like, first UE 120 may attempt to transmit the information ina slot after slot n. In some aspects, first UE 120 may initiatedeferring the transmission, reselecting resource blocks, reencoding theinformation, a combination thereof, and/or the like in slot n−1 (e.g.,based at least in part on evaluating that the set of resources is notavailable). In this way, first UE 120 proactively initiates furtherattempts to transmit the information, thereby reducing a delay relativeto waiting to slot n to initiate another transmission attempt.

As indicated above, FIGS. 3A and 3B are provided as examples. Otherexamples may differ from what is described with respect to FIGS. 3A and3B.

FIG. 4 is a diagram illustrating an example process 400 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 400 is an example where a UE (e.g., UE 120)performs resource exclusion for device to device communication.

As shown in FIG. 4, in some aspects, process 400 may includedetermining, in a first time slot, whether a selected subset ofcandidate resources is still available for transmission to another UE ina second time slot that is after the first time slot (block 410). Forexample, the UE (e.g., using controller/processor 280 and/or the like)may determine, in a first time slot, whether a selected subset ofcandidate resources is still available for transmission to another UE ina second time slot that is after the first time slot, as describedabove.

As shown in FIG. 4, in some aspects, process 400 may include selectivelytransmitting information to the other UE in the second time slot basedat least in part on whether the selected subset of candidate resourcesis still available (block 420). For example, the UE (e.g., usingcontroller/processor 280, transmit processor 264, TX MIMO processor 266,MOD 254, antenna 252, and/or the like) may selectively transmitinformation to the other UE in the second time slot based at least inpart on whether the selected subset of candidate resources is stillavailable, as described above.

Process 400 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In some aspects, the UE is configured to determine at least oneprocessing timeline for preparing to transmit the information based atleast in part on a UE capability of the UE. In some aspects, aprocessing timeline, of the at least one processing timeline, is definedfor at least determining whether the selected subset of candidateresources is still available and as a processing time needed fromreception of control information to determine resources that areoccupied or available for utilization.

In some aspects, a processing timeline, of the at least one processingtimeline, is defined for at least mapping at least one symbol to atleast one alternate resource block and as a processing time fromreception of control information to determine at least one availableresource for utilization, select a subset of the at least one availableresource for utilization, map at least one generated modulated symbol tothe subset of the at least one available resource for utilization,generate a waveform for the at least one modulated symbol, and ready anantenna to transmit the waveform. In some aspects, a processingtimeline, of the at least one processing timeline, is defined for atleast a processing time for reencoding and modulating at least oneresource block and as a processing time from reception of controlinformation to determine at least one available resource forutilization, re-encode the information and generate a physical channel,map at least one generated modulated symbol to at least one selectedresource, generate a waveform for the at least one modulated symbol, andready an antenna to transmit the waveform.

In some aspects, the at least one processing timeline is defined by atleast one of: a quantity of slots, a quantity of symbols, or an amountof time. In some aspects, the at least one processing timeline is basedat least in part on a subcarrier spacing. In some aspects, the selectedsubset of candidate resources is still available and the UE is totransmit the information to the other UE in the second time slot.

In some aspects, a waveform is generated, before the first time slot,for transmitting the information to the other UE in the second timeslot. In some aspects, the selected subset of candidate resources is notstill available and the UE is not to transmit the information to theother UE in the second time slot. In some aspects, a difference betweenthe second time slot and the first time slot is equal to or greater thana processing time for determining whether the selected subset ofcandidate resources is still available.

In some aspects, the UE is configured to re-attempt to transmit theinformation to the other UE in a third slot after the second time slotbased at least in part on not transmitting the information to the otherUE in the second time slot. In some aspects, the UE is configured tore-attempt to transmit the information based at least in part on theselected subset of candidate resources being available for transmissionin the third slot. In some aspects, the UE is configured to re-attemptto transmit the information in the third slot based at least in part ona processing time for mapping at least one symbol to at least onealternate resource block and an expected delay for current resourceblocks to become available.

In some aspects, the UE is configured to reselect at least one resourceblock for transmission in a third slot based at least in part on nottransmitting the information to the other UE in the second time slot. Insome aspects, the UE is configured to reselect the at least one resourceblock based at least in part on at least one of: an availability of analternate subset of candidate resources, a processing time for mappingat least one symbol to at least one resource block, a processing timefor reencoding and modulating at least one resource block, or acombination thereof. In some aspects, the UE is configured, based atleast in part on a link budget requirement, to alter a modulation andcoding scheme and reencode the information after not transmitting theinformation to the other UE in the second time slot.

In some aspects, the UE is configured to re-encode the information andreselect new candidate resources for transmission of the information ina third slot based at least in part on not transmitting the informationto the UE in the second time slot. In some aspects, the third slot is onor after a period of time defined by a processing time for reencodingand modulating at least one resource block ahead before the first timeslot. In some aspects, the UE is configured to re-encode the informationand reselect the new candidate resources based at least in part on anavailability, in the third slot, of an alternate subset of candidateresources of a smaller size than the selected subset of candidateresources.

In some aspects, the UE is configured to re-encode the information andreselect the new candidate resources based at least in part on a qualityof service requirement. In some aspects, the UE is configured toregenerate an orthogonal frequency division multiplexing (OFDM) signalconcurrent with the determining whether the selected subset of candidateresources is still available. In some aspects, the UE is configured toreceive control information for a transmission opportunity at a thirdslot concurrent with the determining whether the selected subset ofcandidate resources is still available.

In some aspects, the UE is configured to determine a quantity ofresources for transmission of the information and a location of thesecond time slot before determining whether the selected subset ofcandidate resources is still available. In some aspects, the UE isconfigured to generate modulated symbols to transmit the informationbefore determining whether the selected subset of candidate resources isstill available. In some aspects, the UE is configured to selectresources as the selected subset of candidate resources beforedetermining whether the selected subset of candidate resources is stillavailable.

Although FIG. 4 shows example blocks of process 400, in some aspects,process 400 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 4.Additionally, or alternatively, two or more of the blocks of process 400may be performed in parallel.

FIG. 5 is a diagram illustrating an example process 500 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 500 is an example where the UE (e.g., UE 120and/or the like) performs operations associated with resource exclusionfor device to device communication.

As shown in FIG. 5, in some aspects, process 500 may include selecting,in a first time slot, a set of resources to use for transmission toanother UE (block 510). For example, the UE (e.g., controller/processor280 and/or the like) may select, in a first time slot, a set ofresources to use for transmission to another UE, as described above.

As further shown in FIG. 5, in some aspects, process 500 may includeevaluating, in a second time slot, whether one or more resources of theset of resources is available (block 520). For example, the UE (e.g.,controller/processor 280 and/or the like) may evaluate, in a second timeslot, whether one or more resources of the set of resources isavailable, as described above.

As further shown in FIG. 5, in some aspects, process 500 may includetransmitting, based on the one or more resources of the set of resourcesbeing available, information to the other UE in a third time slot andusing the set of resources (block 530). For example, the UE (e.g., usingcontroller/processor 280, transmit processor 264, TX MIMO processor 266,MOD 254, antenna 252, and/or the like) may transmit, based on the one ormore resources of the set of resources being available, information tothe other UE in a third time slot and using the set of resources, asdescribed above.

As further shown in FIG. 5, in some aspects, process 500 may includereselecting, based on the one or more resources of the set of resourcesbeing unavailable, another resource for transmission of the informationto the other UE (block 540). For example, the UE (e.g., using antenna252, DEMOD 254, MIMO detector 256, receive processor 258,controller/processor 280, and/or the like) may reselect, based on theone or more resources of the set of resources being unavailable, anotherresource for transmission of the information to the other UE, asdescribed above.

Process 500 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, process 500 includes indicating the selection of theset of resources based at least in part on selecting the set ofresources.

In a second aspect, alone or in combination with the first aspect, thesecond time slot is defined with respect to the third time slot and atleast one processing timeline for preparing to transmit the information.

In a third aspect, alone or in combination with one or more of the firstand second aspects, a processing timeline, of the at least oneprocessing timeline, is defined for at least determining whether the setof resources is available and as a processing time from reception ofcontrol information to determine resources that are unavailable oravailable for utilization.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the at least one processing timeline isdefined as a quantity of slots.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the at least one processing timeline is based atleast in part on a UE capability of the UE.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the at least one processing timeline is based atleast in part on a subcarrier spacing.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, a fourth time slot for reselecting anotherresource is defined with respect to a processing timeline, and theprocessing timeline is defined for at least mapping at least one symbolto at least one alternate resource block and as a processing time fromreception of control information to determine at least one availableresource for utilization, select a subset of the at least one availableresource for utilization, map at least one generated modulated symbol tothe subset of the at least one available resource for utilization,generate a waveform for the at least one generated modulated symbol, andready an antenna to transmit the waveform.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, a fourth time slot for reselectinganother resource is defined with respect to a processing timeline, andthe processing timeline is defined for at least a processing time forrate matching and modulating at least one resource block and as aprocessing time from reception of control information to determine atleast one available resource for utilization, re-encode the informationand generate a physical channel, map at least one generated modulatedsymbol to at least one selected resource, generate a waveform for the atleast one generated modulated symbol, and ready an antenna to transmitthe waveform.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, process 500 includes generating a waveform,before the second time slot, for transmitting the information to theother UE in the third time slot.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, a difference between the third time slot and thesecond time slot is equal to or greater than a processing time fordetermining whether the set of resources is available.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, process 500 includes transmitting, in afourth time slot, the information to the other UE using the otherresource.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, the other resource is a part of the setof resources in the fourth time slot.

In a thirteenth aspect, alone or in combination with one or more of thefirst through twelfth aspects, process 500 includes transmitting theinformation in the fourth time slot based at least in part on aprocessing time for mapping at least one symbol to at least onealternate resource block and a delay for current resource blocks tobecome available.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, reselecting the other resourceincludes reselecting the at least one alternate resource block based atleast in part on at least one of: an availability of an alternate set ofresources, a processing time for mapping at least one symbol to at leastone resource block, a processing time for reencoding and modulating atleast one resource block, or a combination thereof.

In a fifteenth aspect, alone or in combination with one or more of thefirst through fourteenth aspects, process 500 includes altering, basedat least in part on a link budget requirement, a modulation and codingscheme; and reencoding the information after reselecting the otherresource.

In a sixteenth aspect, alone or in combination with one or more of thefirst through fifteenth aspects, process 500 includes reselecting theother resource based at least in part on an availability of an alternateset of resources of a smaller size than the set of resources.

In a seventeenth aspect, alone or in combination with one or more of thefirst through sixteenth aspects, process 500 includes reselecting theother resource based at least in part on a quality of servicerequirement.

In an eighteenth aspect, alone or in combination with one or more of thefirst through seventeenth aspects, process 500 includes regenerating anorthogonal frequency division multiplexing (OFDM) signal concurrent withevaluating whether the set of resources is available.

In a nineteenth aspect, alone or in combination with one or more of thefirst through eighteenth aspects, process 500 includes receiving controlinformation for a transmission opportunity at a fourth time slotconcurrent with the evaluating whether the set of resources isavailable.

Although FIG. 5 shows example blocks of process 500, in some aspects,process 500 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 5.Additionally, or alternatively, two or more of the blocks of process 500may be performed in parallel.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, or a combinationof hardware and software. The actual specialized control hardware orsoftware code used to implement these systems and/or methods is notlimiting of the aspects. Thus, the operation and behavior of the systemsand/or methods were described herein without reference to specificsoftware code—it being understood that software and hardware can bedesigned to implement the systems and/or methods based, at least inpart, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by auser equipment (UE), comprising: selecting, in a first time slot, a setof resources to use for transmission to another UE; evaluating, in asecond time slot, whether one or more resources of the set of resourcesis available; and transmitting, based on the one or more resources ofthe set of resources being available, information to the other UE in athird time slot, or reselecting, based on the one or more resources ofthe set of resources being unavailable, another resource fortransmission of the information to the other UE.
 2. The method of claim1, wherein transmitting information to the other UE in the third timeslot comprises: transmitting information to the other UE using the oneor more resources of the set of resources.
 3. The method of claim 1,further comprising: indicating the selection of the set of resourcesbased at least in part on selecting the set of resources.
 4. The methodof claim 1, wherein the second time slot is defined with respect to thethird time slot and at least one processing timeline for preparing totransmit the information.
 5. The method of claim 4, wherein a processingtimeline, of the at least one processing timeline, is defined for atleast determining whether the one or more resources of the set ofresources are available and as a processing time from reception ofcontrol information to determine resources that are unavailable oravailable for utilization.
 6. The method of claim 4, wherein the atleast one processing timeline is defined as a quantity of slots.
 7. Themethod of claim 4, wherein the at least one processing timeline is basedat least in part on a UE capability of the UE.
 8. The method of claim 4,wherein the at least one processing timeline is based at least in parton a subcarrier spacing.
 9. The method of claim 1, wherein a fourth timeslot for reselecting another resource is defined with respect to aprocessing timeline, and wherein the processing timeline is defined by astart point and a duration, wherein the start point is reception ofcontrol information, and wherein duration is defined based at least inpart on an amount of processing time to perform a set of operations, theset of operations including: mapping at least one symbol to at least onealternate resource block, determining at least one available resourcefor utilization, selecting a subset of the at least one availableresource for utilization, mapping at least one generated modulatedsymbol to the subset of the at least one available resource forutilization, generating a waveform for the at least one generatedmodulated symbol, and readying an antenna to transmit the waveform. 10.The method of claim 1, wherein a fourth time slot for reselectinganother resource is defined with respect to a processing timeline, andwherein the processing timeline is defined by a start point and aduration, wherein the start point is reception of control information,and wherein the duration is defined based at least in part on an amountof processing time to perform a set of operations, the set of operationsincluding: rate matching and modulating at least one resource block,determining at least one available resource for utilization, re-encodingthe information and generating a physical channel, mapping at least onegenerated modulated symbol to at least one selected resource, generatinga waveform for the at least one generated modulated symbol, and readyingan antenna to transmit the waveform.
 11. The method of claim 1, furthercomprising: generating a waveform, before the second time slot, fortransmitting the information to the other UE in the third time slot. 12.The method of claim 1, wherein a difference between the third time slotand the second time slot is equal to or greater than a processing timefor determining whether the one or more resources of the set ofresources is available.
 13. The method of claim 1, further comprising:transmitting, in a fourth time slot, the information to the other UEusing the other resource.
 14. The method of claim 13, wherein the otherresource is a part of the set of resources in the fourth time slot. 15.The method of claim 13, further comprising: transmitting the informationin the fourth time slot based at least in part on a processing time formapping at least one symbol to at least one alternate resource block anda delay for current resource blocks to become available.
 16. The methodof claim 15, wherein reselecting the other resource comprises:reselecting the at least one alternate resource block based at least inpart on at least one of: an availability of an alternate set ofresources, a processing time for mapping at least one symbol to at leastone resource block, a processing time for reencoding and modulating atleast one resource block, or a combination thereof.
 17. The method ofclaim 1, further comprising: altering, based at least in part on a linkbudget requirement, a modulation and coding scheme; and re-encoding theinformation after reselecting the other resource.
 18. The method ofclaim 1, further comprising: reselecting the other resource based atleast in part on an availability of an alternate set of resources of asmaller size than the set of resources.
 19. The method of claim 1,further comprising: reselecting the other resource based at least inpart on a quality of service requirement.
 20. The method of claim 1,further comprising: regenerating an orthogonal frequency divisionmultiplexing (OFDM) signal concurrent with evaluating whether the set ofresources is available.
 21. The method of claim 1, further comprising:receiving control information for a transmission opportunity at a fourthtime slot concurrent with the evaluating whether the set of resources isavailable.
 22. A user equipment (UE) for wireless communication,comprising: a memory; and one or more processors coupled to the memory,the memory and the one or more processors configured to: select, in afirst time slot, a set of resources to use for transmission to anotherUE; evaluate, in a second time slot, whether one or more resources ofthe set of resources is available; and transmit, based on the one ormore resources of the set of resources being available, information tothe other UE in a third time slot, or reselect, based on the one or moreresources of the set of resources being unavailable, another resourcefor transmission of the information to the other UE.
 23. The UE of claim22, wherein the memory and the one or more processors are furtherconfigured to: indicate the selection of the set of resources based atleast in part on selecting the set of resources.
 24. The UE of claim 22,wherein the second time slot is defined with respect to the third timeslot and at least one processing timeline for preparing to transmit theinformation.
 25. A non-transitory computer-readable medium storing oneor more instructions for wireless communication, the one or moreinstructions comprising: one or more instructions that, when executed byone or more processors of a user equipment (UE), cause the one or moreprocessors to: select, in a first time slot, a set of resources to usefor transmission to another UE; evaluate, in a second time slot, whetherone or more resources of the set of resources is available; andtransmit, based on the one or more resources of the set of resourcesbeing available, information to the other UE in a third time slot, orreselect, based on the one or more resources of the set of resourcesbeing unavailable, another resource for transmission of the informationto the other UE.
 26. The non-transitory computer-readable medium ofclaim 25, wherein the one or more instructions, when executed by the oneor more processors, further cause the one or more processors to:indicate the selection of the set of resources based at least in part onselecting the set of resources.
 27. The non-transitory computer-readablemedium of claim 25, wherein the second time slot is defined with respectto the third time slot and at least one processing timeline forpreparing to transmit the information.
 28. The non-transitorycomputer-readable medium of claim 27, wherein a processing timeline, ofthe at least one processing timeline, is defined for at leastdetermining whether the set of resources is available and as aprocessing time from reception of control information to determineresources that are unavailable or available for utilization.
 29. Anapparatus for wireless communication, comprising: means for selecting,in a first time slot, a set of resources to use for transmission toanother UE; means for evaluating, in a second time slot, whether one ormore resources of the set of resources is available; and means fortransmitting, based on the one or more resources of the set of resourcesbeing available, information to the other UE in a third time slot, ormeans for reselecting, based on the one or more resources of the set ofresources being unavailable, another resource for transmission of theinformation to the other UE.
 30. The apparatus of claim 29, furthercomprising: means for indicating the selection of the set of resourcesbased at least in part on selecting the set of resources.